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static RGB unixTerminalDollarFinder_destColor = rgb("#5650C3");

static L<Rect> unixTerminalDollarFinder(BufferedImage screenshot) {
  int w = screenshot.getWidth(), h = screenshot.getHeight();
  BWImage bw = new BWImage(w, h);
  int destColorInt = unixTerminalDollarFinder_destColor.getInt();
  for y to h: for x to w: {
    float diff = rgbDiff(screenshot.getRGB(x, y), destColorInt);
    diff = (diff-0.2f)*10f;
    bw.setPixel(x, y, diff);
  }
  final L<Rect> rects = sortRectsByMiddleY(autoSegment(bw, 2));

  L<Rect> l2 = rectsWithSize(rects, 10, 17);
  new L<Rect> found;
  for (Rect r : l2) {
    SimpleRecognizer.GlyphInfo gi = simpleRecognizer().recognizeGlyph(bw.clip(r));
    if (eq(gi.meaning, "$"))
      found.add(r);
  }
  ret found; 
}